US4145212A - Process for recovering silver and optionally gold from a solid starting material containing said metals - Google Patents

Process for recovering silver and optionally gold from a solid starting material containing said metals Download PDF

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Publication number
US4145212A
US4145212A US05/843,305 US84330577A US4145212A US 4145212 A US4145212 A US 4145212A US 84330577 A US84330577 A US 84330577A US 4145212 A US4145212 A US 4145212A
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silver
thiourea
gold
process according
present
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Fernand J. J. Bodson
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Societe des Mines et Fonderies de Zinc de la Vieille Montagne SA
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Societe des Mines et Fonderies de Zinc de la Vieille Montagne SA
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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G7/00—Compounds of gold
    • C01G7/003—Preparation involving a liquid-liquid extraction, an adsorption or an ion-exchange
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G5/00—Compounds of silver
    • C01G5/003—Preparation involving a liquid-liquid extraction, an adsorption or an ion-exchange
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
    • C22B3/04—Extraction of metal compounds from ores or concentrates by wet processes by leaching
    • C22B3/16—Extraction of metal compounds from ores or concentrates by wet processes by leaching in organic solutions
    • C22B3/1608—Leaching with acyclic or carbocyclic agents
    • C22B3/1616—Leaching with acyclic or carbocyclic agents of a single type
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
    • C22B3/20—Treatment or purification of solutions, e.g. obtained by leaching
    • C22B3/44—Treatment or purification of solutions, e.g. obtained by leaching by chemical processes
    • C22B3/46—Treatment or purification of solutions, e.g. obtained by leaching by chemical processes by substitution, e.g. by cementation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the present invention provides a simple and economical process for recovering, in substantially quantitative yield, the silver and the gold contained in silver bearing materials assaying about 1-1.5 of silver.
  • Such silver bearing materials are for instance, but not exclusively, solid concentrates resulting from the flotation of residues of the lixiviation of zinc ores.
  • This latter flotation concentrate contains, generally, about 1 to 1.5% of silver in the form of free sulphides or coated with elemental sulphur.
  • the present invention relates to a process for recovering silver and possibly gold contained in a silver and possibly gold bearing solid starting material, in which said metals are present in low proportions, a part thereof being in the form of free sulphides, possibly in mixture with elemental sulphur, said process comprising treating the starting material by means of an aqueous solution of thiourea, so as to render soluble the silver and the gold in the form of complexes with the thiourea, and subjecting the obtained solution to a cementation by means of a metal, so as to obtain a cement containing more than about 90% of silver.
  • the solid starting material may be dispersed in an aqueous solution of thiourea, the obtained suspension is acidified to a pH of about 1.5 to 2.5, the acid suspension is heated under constant stirring, the obtained solution is filtered off and the filtrate is subjected to a cementation by means of aluminum.
  • oxidizing agent one may use hydrogen peroxide, an organic oxide, a persulphate or ferric chloride.
  • the amount of oxidizing agent to be used must be sufficient to convert into sulphates the proportion of silver and gold sulphides which doesn't form spontaneously a water soluble complex with the thiourea.
  • the concerned sulphates form more easily a complex with the thiourea than the sulphides.
  • the preferred oxidizing agent is hydrogen peroxide, which is suitably used in an amount equal to about two times the stoichiometric amount of silver and gold in the form which is not solubilized by the thiourea.
  • This solvent may be selected from carbon sulphide and the chlorinated olefins, such as perchloroethylene and trichloroethylene.
  • the amount of organic solvent to be used is preferably comprised between about 10 ml and 1000 ml, for each 150 grams of starting silver and gold bearing material.
  • the obtained mixture is heated to boiling at reflux, preferably for 2 to 4 hours, after which the organic solvent is removed by distillation, from the aqueous phase or solution containing the silver and possibly the gold, solubilized in the form of complexes with the thiourea.
  • a flocculation agent such as gelatine or bone-glue
  • a flocculation agent such as gelatine or bone-glue
  • the amount of flocculation agent is suitably comprised between 50 and 200 milligrams of said agent per 150 grams of silver and possibly gold bearing starting material.
  • the residue of the filtration of the aqueous solution containing the silver and possibly the gold complexes with the thiourea is washed with water or, preferably, by means of an aqueous solution of thiourea, and these washing waters are added to the filtrate before the cementation.
  • the aqueous solution and the washing waters contain, in a dissolved form, beside the silver and the gold, traces of other elements, such as copper, manganese, lead, cadmium and arsenic.
  • cementation which constitutes the second essential stage of the process according to the invention, several fractions of aluminum powder are added to the aqueous solution containing the silver and possibly the gold, solubilized in the form of complexes with the thiourea, in a sufficient amount to cementate all the silver and the gold.
  • the used aluminum is preferably in the form of a powder having particle sizes comprised between about 0.075 and 1.2 millimeters, the purity of said metal being, preferably, from 99 to 99.8%.
  • the total amount of used aluminum is conveniently about 10% by weight with respect to the amount of silver which is present.
  • the cementation is performed by heating the aqueous silver and possibly gold bearing liquor to a temperature of about 50° to 60° C., for one hour.
  • the cement of silver, gold and aluminum, which has precipitated, is removed by filtration and the filtrate is recycled, after having readjusted its thiourea content.
  • the thus obtained cement contains about 90 to 98% of silver, the remainder being gold, copper, aluminum, lead, zinc, silica, etc.
  • Said cement may, if desired, be converted into an ingot, by melting at a temperature of about 1050° C. under a layer of borax.
  • the ingot of gold containing silver may be refined by known methods, such as by electrorefining.
  • FIGURE of the attached drawing shows schematically an installation for carrying out the process according to the invention.
  • the installation comprises a first tank 1, in which a silver and gold bearing starting material (such as a flotation concentrate of residues resulting from the lixiviation of zinc ores), issuing from a hopper 2 is mixed to an aqueous solution of thiourea issuing from a storage tank 3 through a pipe 4.
  • Tank 1 is provided with a stirrer 5.
  • the aqueous suspension which is formed in tank 1 is sent through a pipe 6 provided with a pump 10 to a closed chamber 7, provided with a stirrer 8 and heating means schematically indicated in 9.
  • a supplement of thiourea in aqueous solution may be introduced in this chamber 7 through a pipe 10 which is connected to pipe 4; an oxidizing agent, such as hydrogen peroxide, coming from a feeding tank 12, may be introduced through a pipe 11; and sulphuric acid, coming from a feeding tank 14, may be introduced through a pipe 13.
  • an oxidizing agent such as hydrogen peroxide, coming from a feeding tank 12
  • sulphuric acid coming from a feeding tank 14
  • an organic solvent such as trichloroethylene or carbon sulphide, may be introduced from a storage tank 15 through a pipe 16 and a pump, into the chamber 7.
  • the trichloroethylene or carbon sulphide vapours emanating from chamber 7 are condensed in an exchanger 17 cooled by means of water.
  • the condensed vapours then run into the storage tank 15, from where they may be returned to the chamber 7.
  • the aqueous solution of Ag and Au thiourea complexes formed in the chamber 7 are sent through a pipe 18 to a filter-press 19. Up-stream of the inlet of the filter-press 19, an aqueous solution of gelatin, acting as a flocculation agent may be added to said aqueous solution through a pipe 20 connected to pipe 18, said gelatin solution being stored in a feeding tank 21.
  • the residues of the filtration performed in the filter-press 19 may be washed by means of an aqueous solution of thiourea contained in the storage tank 3, the washing solution being conveyed to the filter-press through a pipe 22 which is connected to pipe 4.
  • the filtrate issuing from the filter-press 19 through a pipe 23 is sent into a cementation tank 24 provided with a stirrer 31; into this cementation tank 24 further emerges a pipe 25 connected to a storage tank of aluminum powder 27, and this cementation tank 24 is provided with heating means 26.
  • the cement formed in tank 24 is filtered in a filter-press 28 and recovered in 29, whereas the filtrate is sent to storage tank 3.
  • the pumps are indicated with the reference notation P and the taps or valves regulating the flow of the solutions or solid products are indicated with the reference numeral 30.
  • 225 g of a flotation concentrate of residues resulting from the lixiviation of zinc ores, containing 1.44% of silver, are dispersed in an aqueous solution of 20 g/l of thiourea, so as to obtain a slurry having a volume of 1500 ml.
  • Concentrated sulphuric acid is added to obtain a pH of 2.
  • the temperature is increased to 85° C.
  • the residue is filtered off.
  • the filtrate has a pH of 2.5.
  • the volume of the filtrate is 1330 ml and contains 1.854 g of Ag/l.
  • the residue is washed with 250 ml of an aqueous solution of 20 g/l of thiourea.
  • the dried residue has a weight of 224.6 and contains 2600 g of Ag per ton.
  • the solution and the washing water are recovered and combined; one obtains in this way a total volume of 1.495 l of a solution containing 1.763 of silver/l.
  • the silver balance may thus be expressed as follows:
  • 225g of a flotation concentrate, containing 1.44% of silver are dispersed in an aqueous solution of 20 g/l of thiourea, so as to obtain a slurry having a volume of 1500 ml.
  • Concentrated sulphuric acid is added to obtain a pH of 2. Further 100 ml of perchloroethylene are added to the slurry. The temperature is increased to the boiling temperature. After 2 hours of reaction, during which the perchloroethylene is constantly refluxed, the perchloroethylene is distilled off and the solution is filtered.
  • the volume of the filtrate is 1320 ml; it contains 2.0913 g of silver per liter.
  • the residue is washed with an aqueous solution of 20 g/l of thiourea.
  • the washing waters have a volume of 275 ml and contain 0.668g of silver per liter.
  • the residue weighs 220.3 g and contains 1 710 g Ag/Ton.
  • the balance of silver may be established as follows:
  • the solution and the washing water are recovered and combined.
  • This solution is brought to a temperature comprised between 50° C. and 60° C. 280mg of granulated aluminum are added in two times.
  • the balance may be established as follows:
  • 225g of a flotation concentrate containing 1.44% of silver are dispersed in an aqueous solution of 20 g/l of thiourea so as to obtain a slurry having a volume of 1500 ml.
  • Concentrated sulphuric acid is added to obtain a pH of 2. Further, one adds 20 ml of CS 2 . The mixture is brought to the boiling temperature, which is 60° C. During the reaction the CS 2 is constantly refluxed. After three hours the pH has increased to 2.5. The CS 2 is expelled by distillation and the solution is filtered.
  • the volume of the filtrate is 1380 ml. It contains 2.09 g of silver per liter.
  • the residue is washed with 250 ml of an aqueous olution of 20 g/l of thiourea.
  • the washing waters have a volume of 250 ml and contain 0.8408 g of silver per liter.
  • the dried residue weighs 221.8 g and contains 850 g of silver/ton.
  • This solution is heated to a temperature comprised between 50° C. and 60° C. 300 mg of granulated aluminum are then added in four times. After one hour the obtained precipitate is filtered. One recovers 1620 ml of a solution containing 25 mg of silver per liter and a cement weighing 2.984 g, containing 97.5% of silver, 0.17% of aluminum and 1,650 g of gold per ton.
  • a flotation concentrate weighing 220.5 g and containing 1.44% of silver and 33g of gold/ton is dispersed in 1500 ml of water.
  • Sulphuric acid is added so as to obtain a pH of 1.7.
  • the temperature of the slurry is brought to 70° C.
  • the pH has increased to 1.86 and the slurry has a silver content of 1.94 g/liter.
  • 100 ml of trichloroethylene are added, the temperature of the mixture is increased to the boiling temperature which is 73° C. and the mixture is left to react under reflux of the organic compound for 3 hours. After three hours, the pH has a value of 2.45 and the solution contains 2.156 g of silver per liter.
  • the trichloroethylene is then distilled off. After removal of the trichloroethylene, 110 mg of bone glue diluted in water are added to the slurry. One filters and one washes the residues with an aqueous solution of 20g/l of thiourea. The filtrate and the washing waters are collected and one obtains a volume of 2.190 l containing 1.36 g of Ag/l and 2.7 mg/l of gold.
  • the final residue weighs 188g and still contains 250 g of silver per ton and 5.5 g of gold per ton.
  • the solution having a volume of 2.09 l and containing 1.36 g of silver/liter and 2.7 mg of gold/liter is brought to a temperature of 55° C. 300 mg of granulated aluminum are added thereto in two times. After one hour, the obtained precipitate is filtered. One recovers 2.180 l of filtrate containing 40 mg of Ag/l and ⁇ 1 mg of gold/l. The precipitate weighs 3.144 g and contains 89.9% of silver, 1.750 g of gold/ton and 0.20% of aluminum.
  • the slurry is brought to a temperature of 70° C. 0.5 g of H 2 O 2 are then added in fractions. After one hour, 100 ml of trichloroethylene are added and the mixture is brought to the boiling temperature which is 73° C. The mixture is left to react under reflux of the organic product for 2 hours. After 2 hours the solution contains 2.200 g of Ag/l. The trichloroethylene is then distilled off. After removal of the trichloroethylene, one adds to the slurry 110 mg of bone glue diluted in water. One filters then and one washes the filtrate with an aqueous solution of 20 g/l of thiourea.
  • the filtrate and the washing waters are collected and one obtains a volume of 2.195 l containing 1.41 g of Ag/l and 2.9 mg of gold/liter.
  • the final residue weighs 180 g and contains 210 g of Ag/ton and 3.8 g of gold/ton.
  • the solution which has a volume of 2.095 l and which contains 1.41 g of Ag/l and 2.9mg of gold/l is brought to a temperature of 55° C. 300 mg of granulated aluminum are added thereto in two times. After one hour the obtained precipitate is filtered. One recovers 2.2 l of filtrate containing 38 mg of Ag/l and 1 mg of gold/l. The precipitate weighs 3.245 g and contains 90.1% of Ag, 1700 g of gold/ton and 0.20% of aluminum.
  • the balance for the gold is the following:
  • the ingots of gold containing silver may be refined by conventionnal processes such as by electrorefining.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
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US05/843,305 1976-10-19 1977-10-18 Process for recovering silver and optionally gold from a solid starting material containing said metals Expired - Lifetime US4145212A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE6045724A BE847441A (fr) 1976-10-19 1976-10-19 Procede pour recuperer des metaux precieux de matieres en contenant.
BE645724 1976-10-19

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US (1) US4145212A (de)
JP (1) JPS5351127A (de)
AU (1) AU512921B2 (de)
BE (1) BE847441A (de)
CA (1) CA1090141A (de)
DE (1) DE2746661C3 (de)
ES (1) ES463309A1 (de)
FR (1) FR2368546A1 (de)
GB (1) GB1534485A (de)
MX (1) MX148500A (de)
NL (1) NL175322C (de)
ZA (1) ZA776197B (de)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4283224A (en) * 1980-05-05 1981-08-11 Southwire Company Separative treatment of anode slime
FR2476137A1 (fr) * 1980-02-20 1981-08-21 Mines Fond Zinc Vieille Traitement de matieres sulfureuses en vue de recuperer les metaux y contenus
FR2557141A1 (fr) * 1983-12-27 1985-06-28 Sueddeutsche Kalkstickstoff Procede d'obtention de metaux precieux
US4561947A (en) * 1983-02-22 1985-12-31 Skw Trostberg Aktiengesellschaft Process for the recovery of noble metals from ores; which process uses thiourea
US4592779A (en) * 1984-03-09 1986-06-03 Russ James J Method for recovering precious metals from precious metal-bearing materials such as ore and tailings
US4645535A (en) * 1985-08-15 1987-02-24 Little Roger H Method for the recovery of precious metals from ores
EP0257548A1 (de) * 1986-08-26 1988-03-02 Noranda Inc. Verfahren zum Gewinnen von Silber aus Röstblende und aus Rückständen der neutralen oder schwach sauren Zinklaugung mittels Thioharnstoff
US4731113A (en) * 1985-08-15 1988-03-15 Little Roger H Method for the recovery of precious metals from ores
US4778519A (en) * 1987-02-24 1988-10-18 Batric Pesic Recovery of precious metals from a thiourea leach
AU580155B2 (en) * 1985-05-01 1989-01-05 Norcim Investments Pty. Ltd. Gold recovery processes
US4816235A (en) * 1987-02-24 1989-03-28 Batric Pesic Silver and manganese recovery using acidified thiourea
US4902345A (en) * 1989-01-12 1990-02-20 Newmont Gold Co. Treatment of refractory carbonaceous and sulfidic ores or concentrates for precious metal recovery
WO1990010721A1 (en) * 1989-03-07 1990-09-20 Dean Robert Butler Recovery of gold, silver and platinum group metals with various leachants at low pulp densities
US20140251820A1 (en) * 2013-03-06 2014-09-11 First Solar, Inc. Method of recovering a metal from a solution
RU2657254C1 (ru) * 2017-07-21 2018-06-09 Федеральное государственное унитарное предприятие "Горно-химический комбинат" (ФГУП "ГХК") Способ извлечения золота из упорных серебросодержащих сульфидных руд концентратов и вторичного сырья

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE847441A (fr) * 1976-10-19 1977-02-14 Procede pour recuperer des metaux precieux de matieres en contenant.
FR2483463A1 (fr) * 1980-06-03 1981-12-04 Salsigne Mines Produits Chimiq Procede pour la recuperation d'or et/ou d'argent et eventuellement de bismuth contenus dans des minerais sulfures et/ou de sulfoarseniures
EP0057684A1 (de) * 1980-08-06 1982-08-18 Anumin Pty. Limited Wiedergewinnung von wertmetallen
CA1306613C (en) * 1987-05-15 1992-08-25 Guy Deschenes Recovery of gold from aqueous solutions
NZ237011A (en) * 1990-02-23 1992-06-25 Cra Services Extraction and recovery of gold by treatment with an acidic lixiviant solution
JP2012184472A (ja) * 2011-03-04 2012-09-27 Saga Univ 使用済みディスプレイパネルからの銀の回収方法
CN113736997B (zh) * 2021-09-07 2023-05-02 山东国大黄金股份有限公司 一种硫酸协同处理氰化尾渣脱氰浮选回收金银的方法

Citations (3)

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Publication number Priority date Publication date Assignee Title
US2304427A (en) * 1941-06-05 1942-12-08 Monsanto Chemicals Recovery of silver from scrap films
SU129333A1 (ru) * 1959-11-04 1959-11-30 А.Ю. Бейлин Способ осаждени золота и серебра из кислых растворов тиокарбамида
US3317313A (en) * 1960-08-25 1967-05-02 Nat Dev Res Corp Process for the recovery of gold and silver from gold and silver bearing aqueous cyanide liquors and ion exchange resin employed therein

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GB191120066A (en) * 1911-09-09 1912-09-09 Gaston Jacquier Improvements in the Precipitation of Metallic Salts in Dissolution and Apparatus therefor.
DE543304C (de) * 1930-05-01 1932-02-04 I G Farbenindustrie Akt Ges Laugen von Edelmetallen
GB624317A (en) * 1946-07-09 1949-06-02 Hudson Bay Mining & Smelting Activated zinc dust for gold and silver precipitation
US3334995A (en) * 1961-07-31 1967-08-08 Minnesota Mining & Mfg Process of precipitating silver
AU489575B2 (en) * 1972-12-18 1975-06-19 Charles Harold Warman A hydrometallurgical process for the recovery of metals from sulphide ores by oxidation with air or oxygen in ammoniacal solutions
NL7414149A (nl) * 1974-10-29 1976-05-04 Leuven Res & Dev Vzw Werkwijze voor het terugwinnen van zilver uit oplossingen.
BE847441A (fr) * 1976-10-19 1977-02-14 Procede pour recuperer des metaux precieux de matieres en contenant.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2304427A (en) * 1941-06-05 1942-12-08 Monsanto Chemicals Recovery of silver from scrap films
SU129333A1 (ru) * 1959-11-04 1959-11-30 А.Ю. Бейлин Способ осаждени золота и серебра из кислых растворов тиокарбамида
US3317313A (en) * 1960-08-25 1967-05-02 Nat Dev Res Corp Process for the recovery of gold and silver from gold and silver bearing aqueous cyanide liquors and ion exchange resin employed therein

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2476137A1 (fr) * 1980-02-20 1981-08-21 Mines Fond Zinc Vieille Traitement de matieres sulfureuses en vue de recuperer les metaux y contenus
US4283224A (en) * 1980-05-05 1981-08-11 Southwire Company Separative treatment of anode slime
US4561947A (en) * 1983-02-22 1985-12-31 Skw Trostberg Aktiengesellschaft Process for the recovery of noble metals from ores; which process uses thiourea
FR2557141A1 (fr) * 1983-12-27 1985-06-28 Sueddeutsche Kalkstickstoff Procede d'obtention de metaux precieux
US4592779A (en) * 1984-03-09 1986-06-03 Russ James J Method for recovering precious metals from precious metal-bearing materials such as ore and tailings
AU580155B2 (en) * 1985-05-01 1989-01-05 Norcim Investments Pty. Ltd. Gold recovery processes
US4645535A (en) * 1985-08-15 1987-02-24 Little Roger H Method for the recovery of precious metals from ores
US4731113A (en) * 1985-08-15 1988-03-15 Little Roger H Method for the recovery of precious metals from ores
AU590113B2 (en) * 1986-08-26 1989-10-26 Noranda Inc. Process for the recovery of silver from zinc plant calcines and neutral or low acid leach residues with thiourea
EP0257548A1 (de) * 1986-08-26 1988-03-02 Noranda Inc. Verfahren zum Gewinnen von Silber aus Röstblende und aus Rückständen der neutralen oder schwach sauren Zinklaugung mittels Thioharnstoff
US4778519A (en) * 1987-02-24 1988-10-18 Batric Pesic Recovery of precious metals from a thiourea leach
US4816235A (en) * 1987-02-24 1989-03-28 Batric Pesic Silver and manganese recovery using acidified thiourea
US4902345A (en) * 1989-01-12 1990-02-20 Newmont Gold Co. Treatment of refractory carbonaceous and sulfidic ores or concentrates for precious metal recovery
WO1990010721A1 (en) * 1989-03-07 1990-09-20 Dean Robert Butler Recovery of gold, silver and platinum group metals with various leachants at low pulp densities
GB2248631A (en) * 1989-03-07 1992-04-15 Dean Robert Butler Recovery of gold, silver and platinum group metals with various leachants at low pulp densities
GB2248631B (en) * 1989-03-07 1993-06-09 Dean Robert Butler Recovery of gold, silver and platinum group metals with various leachants at low pulp densities
US20140251820A1 (en) * 2013-03-06 2014-09-11 First Solar, Inc. Method of recovering a metal from a solution
RU2657254C1 (ru) * 2017-07-21 2018-06-09 Федеральное государственное унитарное предприятие "Горно-химический комбинат" (ФГУП "ГХК") Способ извлечения золота из упорных серебросодержащих сульфидных руд концентратов и вторичного сырья

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NL175322C (nl) 1984-10-16
BE847441A (fr) 1977-02-14
DE2746661B2 (de) 1981-04-16
FR2368546A1 (fr) 1978-05-19
JPS5654374B2 (de) 1981-12-25
DE2746661A1 (de) 1978-04-20
NL175322B (nl) 1984-05-16
DE2746661C3 (de) 1981-12-17
NL7711407A (nl) 1978-04-21
AU512921B2 (en) 1980-11-06
AU2983777A (en) 1979-04-26
JPS5351127A (en) 1978-05-10
ES463309A1 (es) 1978-07-16
MX148500A (es) 1983-04-27
FR2368546B1 (de) 1983-02-25
GB1534485A (en) 1978-12-06
CA1090141A (fr) 1980-11-25
ZA776197B (en) 1978-06-28

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